Lecture9-1 - Lecture 8: Introduction to Animal Diversity...

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Lecture 8: Introduction to Animal Diversity Invertebrates Chapter 32 & 33
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Animals evolved from a choanoflagellate-like ancestor
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Some characteristics of animals: heterotrophic organisms that ingest food multicellular animal cells lack a cell wall unique cellular junctions and cell types (nerve and muscle) most reproduce sexually undergo characteristic developmental stages - cleavage, blastula, gastrula
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Animals body plans - a set of morphological and developmental traits that define a group of animals species sharing the same level of organizational complexity 1. No (Sponges) vs. Radial vs. Bilateral Symmetry top ( oral ) and bottom ( aboral ); no ends; no sides top ( dorsal ) and bottom ( ventral ); head ( anterior ) and tail ( posterior ) ends; left and right sides
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Animals body plans - a set of morphological and developmental traits that define a group of animals species that share the same level of organizational complexity 2. No true tissues (sponges) vs. Diploblast vs. Triploblast true tissue = collection of specialized cells isolated from other tissues by membranous layers Diploblasts have two tissue layers (germ layers) = ectoderm and endoderm Triploblasts have three germ layers = also have mesoderm
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Diploblast Radial Triploblast Bilateral No tissues No symmetry All animals Note: here we are not yet implying evolutionary relationships, only grouping animals differently based on body plans
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Animals body plans - a set of morphological and developmental traits that define a group of animals species that share the same level of organizational complexity 3. Acoelomate, Pseudocoelomate, vs. Coelomate body cavities coelom lined with mesoderm pseudocoelom line partially with mesoderm no coelom
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Diploblast Radial Triploblast Bilateral No tissues No symmetry All animals Pseudocoelomates Coelomates Acoelomates
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Animals body plans - a set of morphological and developmental traits that define a group of animals
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Lecture9-1 - Lecture 8: Introduction to Animal Diversity...

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